Stock sub plus aftermarket sub

[viet510racer]

generally speaking, can you have the stock sub in the SL premium sound system and a after market sub with an amp (combine)?

are there any harm in that? would both system draw too much current? will i blow a fuse? please tell me what do you think (pros and cons)

[randy8876]

Current will be completely dependent on your amplifier and how much you turn up the volume. I have amps capable of 2000 watts RMS and have no issues with the current draw.

You'll find a lot of negative reviews regarding using multiple subs of different brands. But most of that is due to frequency overlap. You could crossover the stock sub at 60 Hz and run a 15" sub to cover below 60 Hz.